2. A lilly from a true-breeding line with white flowers and short corollas (line

Question

2. A lilly from a true-breeding line with white flowers and short corollas (line A) is crossed to a lilly from a true-breeding line with black flowers and long corollas (line B). The resulting offspring, the F1, are all red-flowered, with corollas of medium length. Suppose an individual from the F1 is crossed to an individual from line A. The resulting offspring are as follows: 50% white flowers and short corollas, 50% red flowers and medium corollas. What type of allelic interaction is this? How many loci are involved? Diagram the cross.

Explanation / Answer

When one locus affects multiple traits, this is known as pleiotropy. Since the parents of the F1 plants are true-breeding lines for each phenotype, that means the F1 plants are heterozygous for all traits. Thus, they can produce gametes with every combination of color/corolla, so 2^2, or 4 unique types of gametes with respect to these two traits.

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